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1 // Template array classes |
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_DiagArray2_h) |
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25 #define octave_DiagArray2_h 1 |
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26 |
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27 #if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #include <cassert> |
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32 #include <cstdlib> |
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33 |
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34 #include "Array2.h" |
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35 #include "lo-error.h" |
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36 |
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37 class idx_vector; |
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38 |
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39 // A two-dimensional array with diagonal elements only. |
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40 // |
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41 // Idea and example code for Proxy class and functions from: |
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42 // |
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43 // From: kanze@us-es.sel.de (James Kanze) |
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44 // Subject: Re: How to overload [] to do READ/WRITE differently ? |
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45 // Message-ID: <KANZE.93Nov29151407@slsvhdt.us-es.sel.de> |
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46 // Sender: news@us-es.sel.de |
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47 // Date: 29 Nov 1993 14:14:07 GMT |
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48 // -- |
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49 // James Kanze email: kanze@us-es.sel.de |
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50 // GABI Software, Sarl., 8 rue du Faisan, F-67000 Strasbourg, France |
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51 |
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52 template <class T> |
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53 class |
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54 DiagArray2 : public Array<T> |
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55 { |
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56 private: |
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57 |
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58 T get (int i) { return Array<T>::xelem (i); } |
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59 |
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60 void set (const T& val, int i) { Array<T>::xelem (i) = val; } |
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61 |
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62 class Proxy |
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63 { |
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64 public: |
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65 |
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66 Proxy (DiagArray2<T> *ref, int r, int c) |
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67 : i (r), j (c), object (ref) { } |
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68 |
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69 const Proxy& operator = (const T& val) const |
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70 { |
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71 if (i == j) |
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72 { |
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73 if (object) |
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74 object->set (val, i); |
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75 } |
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76 else |
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77 (*current_liboctave_error_handler) |
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78 ("invalid assignment to off-diagonal in diagonal array"); |
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79 |
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80 return *this; |
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81 } |
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82 |
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83 operator T () const |
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84 { |
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85 if (object && i == j) |
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86 return object->get (i); |
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87 else |
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88 { |
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89 static T foo (0); |
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90 return foo; |
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91 } |
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92 } |
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93 |
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94 private: |
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95 |
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96 // XXX FIXME XXX -- this is declared private to keep the user from |
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97 // taking the address of a Proxy. Maybe it should be implemented |
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98 // by means of a companion function in the DiagArray2 class. |
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99 |
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100 T *operator& () const { assert (0); return (T *) 0; } |
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101 |
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102 int i; |
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103 int j; |
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104 |
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105 DiagArray2<T> *object; |
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106 |
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107 }; |
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108 |
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109 friend class Proxy; |
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110 |
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111 protected: |
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112 |
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113 DiagArray2 (T *d, int r, int c) : Array<T> (d, r < c ? r : c) |
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114 { dimensions = dim_vector (r, c); } |
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115 |
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116 public: |
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117 |
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118 DiagArray2 (void) : Array<T> (dim_vector (0, 0)) { } |
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119 |
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120 DiagArray2 (int r, int c) : Array<T> (r < c ? r : c) |
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121 { dimensions = dim_vector (r, c); } |
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122 |
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123 DiagArray2 (int r, int c, const T& val) : Array<T> (r < c ? r : c) |
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124 { |
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125 dimensions = dim_vector (r, c); |
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126 |
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127 fill (val); |
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128 } |
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129 |
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130 DiagArray2 (const Array<T>& a) : Array<T> (a) |
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131 { dimensions = dim_vector (a.length (), a.length ()); } |
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132 |
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133 DiagArray2 (const DiagArray2<T>& a) : Array<T> (a) |
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134 { dimensions = a.dims (); } |
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135 |
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136 ~DiagArray2 (void) { } |
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137 |
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138 DiagArray2<T>& operator = (const DiagArray2<T>& a) |
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139 { |
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140 if (this != &a) |
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141 { |
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142 Array<T>::operator = (a); |
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143 dimensions = a.dims (); |
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144 } |
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145 |
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146 return *this; |
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147 } |
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148 |
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149 #if 0 |
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150 operator Array2<T> () const |
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151 { |
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152 int nr = dim1 (); |
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153 int nc = dim2 (); |
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154 |
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155 Array2<T> retval (nr, nc, T (0)); |
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156 |
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157 int len = nr < nc ? nr : nc; |
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158 |
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159 for (int i = 0; i < len; i++) |
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160 retval.xelem (i, i) = xelem (i, i); |
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161 |
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162 return retval; |
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163 } |
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164 #endif |
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165 |
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166 #if 1 |
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167 Proxy elem (int r, int c) |
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168 { |
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169 return Proxy (this, r, c); |
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170 } |
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171 |
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172 Proxy checkelem (int r, int c) |
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173 { |
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174 if (r < 0 || c < 0 || r >= dim1 () || c >= dim2 ()) |
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175 { |
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176 (*current_liboctave_error_handler) ("range error in DiagArray2"); |
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177 return Proxy (0, r, c); |
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178 } |
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179 else |
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180 return Proxy (this, r, c); |
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181 } |
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182 |
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183 Proxy operator () (int r, int c) |
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184 { |
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185 if (r < 0 || c < 0 || r >= dim1 () || c >= dim2 ()) |
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186 { |
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187 (*current_liboctave_error_handler) ("range error in DiagArray2"); |
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188 return Proxy (0, r, c); |
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189 } |
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190 else |
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191 return Proxy (this, r, c); |
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192 } |
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193 #else |
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194 T& elem (int r, int c); |
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195 T& checkelem (int r, int c); |
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196 T& operator () (int r, int c); |
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197 #endif |
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198 |
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199 T elem (int r, int c) const; |
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200 T checkelem (int r, int c) const; |
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201 T operator () (int r, int c) const; |
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202 |
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203 // No checking. |
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204 |
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205 T& xelem (int r, int c); |
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206 T xelem (int r, int c) const; |
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207 |
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208 void resize (int n, int m); |
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209 void resize (int n, int m, const T& val); |
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210 |
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211 void maybe_delete_elements (idx_vector& i, idx_vector& j); |
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212 }; |
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213 |
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214 #endif |
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215 |
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216 /* |
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217 ;;; Local Variables: *** |
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218 ;;; mode: C++ *** |
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219 ;;; End: *** |
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220 */ |
